.topic-li{
    margin-bottom: 100px;
}
.topic-li>img{
    width: 100%;
}
.topic-tit{
    font-weight: bold;
    font-size: 40px;
    margin: 30px 0;
}
.topic-sub{
    font-size: 30px;
    margin: 50px 0;
}
.topic-price{
    color: brown;
}
.topic-box{
    padding-bottom: 100px;
}
.btns{
    margin: 100px 0;
    display: flex;
}
.rv-button{
    height: 100px !important;
}